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" ... Highly volatile chemicals can be quickly and easily analysed with GC, so why use a third method of analysis? In this case there are two main reasons. Complementary analytical techniques improve the robustness and validity of any results. The GC-MS used here however served a second and more important purpose. Many different terpenes can have the same emperical formula; two or more compounds can contain the same number of carbons, hydrogens and other atoms of each other, and so have the same molecular weight as each other. The atoms in these molecules are arranged differently, hence being different chemicals, but they may all travel through the stationary phase of a chromatography column at the same sort of speed, making their precise identity ambiguous. ... "